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Q: Why do you use mechanical calculators?

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most calculators are powered by solar energy but some are powered by batteries

No, the very first mechanical calculators could only add and subtract. The first mechanical calculators were invented in 1623 by Wilhelm Schickard, followed by the Pascaline, invented in 1645 by Blaise Pascal. However, calculators that could multiply and divide were in use by the 19th century.

scientific calculators have scientific calculations such as scientific notation, but mechanical ones dont.

No because now we have the new "Thing" Calculators! look it up in Wikipedia also!

No, and no.

no but solar panels are in solar calculators

Yes they do use calculators they have very large sums to work out sometimes! Yes they do use calculators they have very large sums to work out sometimes!

simple calculators

“Are there any online retirement or IRA calculators that are free for use?” are there any online retirement or IRA calculators that are free for use?

You can find loan calculators online that do all of the work for you. Bankrate.com has several different financial calculators to use. You simply plug in your numbers and it does the rest.

The disadvantages of calculators is that they are no longer practical or convenient. Unless scientific in nature, most people use the calculators on their smart phones and wireless devices. While stand alone calculators are still in use, their popularity has immensely decreased across the nation.

Enigma was way before computers, it was done by hand and crude mechanical calculators.

We would still be using slide rules and mechanical desk calculators.

It was one of the first mechanical calculators and performed addition and subtraction problems dealing with numbers up to 9,999,999

International Business Machines. Their products were originally cash registers, and mechanical calculators.

Most simple four function calculators utilize solar power; however, it is not uncommon that calculators that use solar power also have a battery backup. The ones that don't are usually very basic four function calculators.

I recommend http://banking.about.com/library/calculators/bl_LoanAmortizationCalculator.htm as an excellent website for amortization calculators that can be used in Microsoft excel

only BOS approved calculators

Elementray school students should not use calculators because by using calculators they rely on them and there is no chance of learning a simple and basic calculation which cause a great trouble in future.

The first mechanical calculator was invented in 1623. In 1961, the fist electronic desktop calculators were made.

There are many FAFSA calculators online. This is the easiest one to use in my opinion. Make sure you have all of your information so that you can easily put the information in the spaces. http://www.finaid.org/calculators/quickefc.phtml

There are a couple different websites which offer free financial calculators. Arachnoid offers financial calculators. Ultimate Calculators is another site which offers easy-to-use financial calculators. Bank Rate is another location where a person may use a financial calculator online.

They didn't have electronic calculators. Abacuses (or is it abaci? no clue... oh well...) are calculators, and they could use them to calculate things.

An arithmometer is essentially a old school calculator. It's mechanical, rather than computerized, like today's calculators.

yes